Cap and peep-hole for blast-furnace twyers.



PATENTED MAY 12, 1903.

G; R. JOHNSON. I GAP AND PEEP HOLE FOR BLASI' FURNACE TWYERS.

APPLIOATIOF FILED FEB. 17,.11903.

I0 MODEL.

UNiTE Patented May 12,1903. I

GUY R. JOHNSON, OF JOLIET, ILLINOIS.

SPECIFICATION forming part of Letters Patent -N 0. 728,1 11, dated May 12, 1903.

Application filed February 17, 1903- Serial No. 143,842. (No model.)

To aZZ wiwmitmay concern: v Be it known that I, GUY -R. JOHNSON, a citizen of the United States, residing atJoliet, in the county of Will andState of'lllinois, have invented new and useful Improvements in Caps and-Peep-Holes for Blast-Furnace Twyers, of which the following is a'specification. a

This invention relates generally to twyers for blast-furnaces, and particularlyto an improved cap and-peep-hole or eye-sight for use on the goosenecks of the twyers thereof. The object of the invention is in a ready,

simple, thoroughly feasible, and practical manner to obviate injury to the peep-hole, such as frequently occurs from the rubbing of the pricking-rod employed in clearing the nose of the twyers, preventing thereby great loss of air and the expense incident to repairing the part thus injured.

A further object is to present a device of the class described which shall combine cheapness of construction, high durability in use, simplicity and strength of design, and the minimum number of parts.

The invention consists, generally stated, in a cap adapted to be secured to the gooseneck and provided with wedge-shaped guides or ways and a peep-hole having a wedge-shaped carrier to engage the guides or ways and provided with an opening constituting a continuation of the peep-hole and with a second opening constituting a pricking-rod-receiving ori flee.

The invention consists,further, in the novel construction and combination of parts of a cap and peep-hole for blast-furnace twyers, as will be hereinafter fully described claimed.

In the accompanying drawings, forming a part of this specification, and inwhich like characters of reference indicate correspond ing parts, there is illustrated one-form of the inventionfcapable of carrying the same into practical operation, it being understood that the elements therein exhibited may be varied or changed as to shape, proportion, and exact manner of assemblage without departing from the spirit thereof, and in these drawlugs- Figure 1 is a viewin side elevation, partly in section, exhibiting the device of this invention as appliedto a furnace. Fig. 2 is a and view in front elevation of the attachment with the cap removed. Fig. 3 is a view in perspective of the carrier or wedge for holding the cap detachably assembled withthe plate or supporton the gooseneck. Fig. dis a horizontal sectional view taken on the line 4 4c of Fig. 2 and looking in the direction of the arrow thereon.

Referring to the drawings, 1 designates the front portion of-an ordinary furnace,provided withth'e usual opening 2,-through which is inserted the twyer 3, of the usual or any preferredcon'struction. The blast is" led to the twyer'by a'belly-pipe 4., secured to a gooseneck 5, which latter through an elbow 6 and joint 7 communicates with the bustle-pipe 8. The gooseneck may be of the usual or any preferred construction and is provided at its rear with a flange 9 or similar device carried by an extension 10, as usual. To the flange isfsecured the cap 11, the connection between the cap and the flange being effected in this instance through the medium of bolts 12.

While this form of assembling of the parts is advantageous as being simple and effective, it is to be understood. thatthe invention is not to be limited to the precise arrangement, as the desired result may be effected in other ways and still be within the scope of the invention. The extension '10 has an orifice 14, which constitutes a continuation of the peephole in the cap, presently to be described.

The cap is provided concentrically of its outer side with a boss 15, and projecting outward beyond theboss are two lugs 16, the under faces of which'are disposed at an angle to .the boss, thus to provide wedgeshaped guides or ways to receive the wedge-shaped carrierl7 of the cap and peep-hole, (designated generally 18.) As shown in Fig. 3, the carrier-17 is provided with a circular threaded orifice 19 and with an elongated orifice 20. The orifice 19 is adapted normally to register with the orifice 14, so that inspection of the interior of the furnace may always be had, except when it Eis-desired to clear out the nose of the twyer, in which event the carrier is moved laterallyto bring. the orifice 20 into alinement with the orifice 14, when a pricking-rod may readily be inserted and the twyer be cleaned. It will be seen from this that it is immaterial to what extent the orifice 14 be worn, as when the carrier is moved to ILO bring the orifice 19 into alinement with the orifice 14 the latter orifice will positively be sealed, and escape of air and gases will thus be prevented. The carrier is positioned at the desired point by being struck with a hammer or other implement. It will be apparent that by the employment of the wedge-shaped carrier and the similarly-shaped guides or ways an air-tight juncture can always be effected between the carrier and the boss thus to efiect the result desired.

It will of course be understood that when the carrier is shifted laterally to bring the orifice 20 into alinement with the orifice 14 the carrier will then be loose in the wedgeshaped guides; but this is immaterial, as it makes no (lifierence when the carrier is in this position, the desideratnm being to have the carrier rigidly held between the guides when the orifice 19 is in register with the orifice 14 to preclude the escape of air, gases, dice. The disposition of the guides is such that when the carrier is moved laterally to bring the orifice 2O opposite the orifice 14 there is no danger of separation of the said carrier from the guides.

The eye-sight comprises a shank 21 and a head or socket 22. The shank is provided with a longitudinal bore 23 and has its extremities threaded and its intermediate portion formed with a polygonal enlargement 24 to constitute a means to be engaged by a wrench in connecting the shan k with the carrier, one of the said threaded terminals being designed to engage the threaded orifice 19 of the carrier. The head is provided with a polygonal portion 25 to be engaged by a wrench, and its outer portion is reduced and provided with a cone-shaped mouth 26, which merges into the bore 23, as clearly shown in Fig. 1. The threaded bore of the head is for a portion of its length reduced in diameter at 27 to receive the reduced outer end 28 of the shank, and between the outer wall 29, formed by the reduced bore 27, and the reduced end 28 of the shank is disposed a sightglass 30, on each side of which is arranged an annulus 31 of some refractory material, preferably asbestos, which will operate to shield the glass from liability of breakage or fracture when the head is being seated upon the shank. The surface of the said glass is so small as to cause it to be absolutely proof against the internal pressure of the furnace, but at the same time affords a perfect means of inspecting the interior of the furnace.

In manufacturing this improved cap and peep-hole, which comprises in its construction the cap 11 and peep-hole or eye-sight and its accessories, they will be made in standard sizes and may be attached to furnaces already in use. Owing to the simplicity of construction and manner of assemblage of the parts of this device, liability of damage or breakage in use is reduced to a minimum; but in the event of breakage repairs may readily be effected at a slight expense.

The arrangement herein shown is one that in practice has been found thoroughly efficient; but it is to be understood that the invention is not to be limited to the exact construction shown, as it may be widely departed from and still be within the scope of the invention.

Having thus described the invention, what I claim is 1. A peep-hole attachment for blast-furnace twyers embodying a cap provided with guides and an eye-sight having a wedgeshaped carrier to engage the guides.

2. A peephole attachment for blast-furnace twyers embodying a cap provided with a boss and with guides, and an eye-sight having a wedge-shaped carrier to engage the boss and the guides.

A peep-hole attachment for blast-furnace twyers embodying a cap provided with a boss and with guides extending over the boss, and an eye-sight having a wedge-shaped carrier to engage the guides. 7

4. A peep-hole attachment for blast-furnace twyers embodying a cap adapted for attachment to the gooseneck and provided with a Wedge-shaped guide or way, and an eyesight having a wedge-shaped carrier to engage the guide or Way.

5. A peep-hole attachment for blast-furnace twyers embodying a cap provided with a wedge-shaped guide, and an eye-sight having a wedge-shaped carrier to engage the guide, said carrier having an independent pricking-rod-receiving orifice.

6. A peep-hole attachment for blast-furnace twyers embodying a carrier, and an eyesight comprising a tubular shank connected with the carrier, a head secured to the shank, and a sight-glass disposed at the outer terminal of the shank and held in position by the head.

'7. A peep-hole attachment for blast-furnace twyers embodying a wedge-shaped carrier provided with a threaded orifice, and with a pricking-rod-receiving orifice, a tubular shank to engage the threaded orifice, and having its outer terminal reduced, at head secured to the reduced terminal, and a sightglass disposed at the said terminal of the shank and held in position by the head.

8. A peep -hole attachment for blast-furnace twyers comprising a cap adapted to be secured to the gooseneck and provided with wedge-shaped guides or ways, and a peephole having a wedge'shaped carrier to engage the guides or Ways and provided with an opening constituting a continuation of the peep-hole and with a second opening constituting a pricking-rod-receiving orifice.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

GUY R. JOHNSON. i/Vitnesses:

JOSEPH MALLATTE, HARRY B. on PONT.

IIO 

